package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import io.swagger.models.auth.In;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.util.StringUtil;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.*;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;
    /**
     * 统计营业额数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        /*
        SELECT DATE(order_time) AS order_time, SUM(amount) AS amount
        FROM orders
        WHERE order_time BETWEEN '2025-03-03' AND '2025-03-06'
        GROUP BY DATE(order_time)
        ORDER BY order_time ASC;
         */
        Map<LocalDate, Long> ordersMap = orderMapper.queryByDate(begin, end.plusDays(1), Orders.COMPLETED)
                .stream()
                .collect(Collectors.toMap(
                        order -> order.getOrderTime().toLocalDate(),                 // LocalDateTime 转 LocalDate
                        order -> order.getAmount().longValue()                // BigDecimal 转 Long
                ));


        //封装TurnoverReportVO里的dateList,当前集合用来存放从begin到end每一天的日期
        List<LocalDate> dateList = new ArrayList<>();
        Map<LocalDate, Long> map = new HashMap<>();
        dateList.add(begin);
        map.put(begin, 0L);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
            map.put(begin, 0L);
        }

        ordersMap.forEach((x,y)->{
            map.put(x, y);
        });

        // 将 Map 的值转换为 String，并用逗号连接
        String result = map.values().stream()             // 获取 map 中的所有 values
                .map(String::valueOf)                     // 将每个 Long 转换为 String
                .collect(Collectors.joining(","));

        //因为map中的顺序不想list一样按添加的顺序排序，所以要重新操作下
        // 1. 按逗号分割成列表
        List<String> list = Arrays.asList(result.split(","));

        // 2. 反转列表
        Collections.reverse(list);

        // 3. 重新拼接成字符串
        result = String.join(",", list);

        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(result)
                .build();
    }

    /**
     * 用户统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的新增用户数量 select count(id) from user where create_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();
        //存放每天的总用户数量 select count(id) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("end", endTime);
            //总用户数量
            Integer totalUser = userMapper.countByMap(map);
            map.put("begin", beginTime);
            //新增用户数量
            Integer newUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    /**
     * 统计指定时间区间内订单数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //select count(id) from orders where
        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();
        Integer totalOrderCount = 0;
        Integer totalValidOrderCount = 0;
        Double orderCompletionRate = 0.0;

        for (LocalDate date : dateList) {
            Map map = new HashMap<>();
            map.put("begin", LocalDateTime.of(date, LocalTime.MIN));
            map.put("end", LocalDateTime.of(date, LocalTime.MAX));
            //查询每天的订单总数
            Integer orderCount = orderMapper.countByMap(map);
            //查询每天的有效订单数
            map.put("status", 5);
            Integer validOrderCount = orderMapper.countByMap(map);
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
            totalOrderCount += orderCount;
            totalValidOrderCount += validOrderCount;
        }
        if (totalOrderCount != 0){
            orderCompletionRate = totalValidOrderCount*1.0/totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(totalValidOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 统计时间区间内的销量排名前十
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> list = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> nameList = list.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> numberList = list.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(nameList,","))
                .numberList(StringUtils.join(numberList,","))
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库，获取营业数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(
                LocalDateTime.of(dateBegin, LocalTime.MIN),
                LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2.通过poi将数据写入excel
        InputStream is = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的excel文件
            XSSFWorkbook excel = new XSSFWorkbook(is);

            //获取表格sheet
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin+" 至 "+dateEnd);
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                BusinessDataVO businessData = workspaceService.getBusinessData(
                        LocalDateTime.of(date, LocalTime.MIN),
                        LocalDateTime.of(date, LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //通过输出流将excel
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
